package com.emergency.common.util;

import eu.bitwalker.useragentutils.UserAgent;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.UnknownHostException;

/**
 * IP地址
 * @author:lijie
 * @date :2019/09/06 22:22
 * IPUtils.java
 */
public class IPUtils {

	private IPUtils() {
	}

	private static final Logger logger = LoggerFactory.getLogger(IPUtils.class);

	public static final String LOCAL_IP_ADDRESS = "127.0.0.1";

	/**
	 * 获取IP地址
	 *
	 * @param request
	 * @return 使用Nginx等反向代理软件, 则不能通过request.getRemoteAddr()获取IP地址
	 * 如果使用了多级反向代理的话,X-Forwarded-For的值并不止一个,而是一串IP地址,X-Forwarded-For
	 * 中第一个非unknown的有效IP字符串，则为真实IP地址
	 */
	public static String getIpAddr(HttpServletRequest request) {
		String ip = null;
		String unknown = "unknown";
		String seperator = ",";
		int maxLength = 15;

		try {
			ip = request.getHeader("x-forwarded-for");
			if (StringUtils.isEmpty(ip) || unknown.equalsIgnoreCase(ip)) {
				ip = request.getHeader("Proxy-Client-IP");
			}
			if (StringUtils.isEmpty(ip) || ip.length() == 0 || unknown.equalsIgnoreCase(ip)) {
				ip = request.getHeader("WL-Proxy-Client-IP");
			}
			if (StringUtils.isEmpty(ip) || unknown.equalsIgnoreCase(ip)) {
				ip = request.getHeader("HTTP_CLIENT_IP");
			}
			if (StringUtils.isEmpty(ip) || unknown.equalsIgnoreCase(ip)) {
				ip = request.getHeader("HTTP_X_FORWARDED_FOR");
			}
			if (StringUtils.isEmpty(ip) || unknown.equalsIgnoreCase(ip)) {
				ip = request.getRemoteAddr();
			}
		} catch (Exception e) {
			logger.error("IPUtils exception ", e);
		}

		//使用代理,则获取第一个IP地址
		if (StringUtils.isNotEmpty(ip) && ip.length() > maxLength) {
			int idx = ip.indexOf(seperator);
			if (idx > 0) {
				ip = ip.substring(0, idx);
			}
		}
		return "0:0:0:0:0:0:0:1".equals(ip) ? LOCAL_IP_ADDRESS : ip;
	}


	/**
	 * 获取ip地址
	 *
	 * @return
	 */
	public static String getIpAddr() {
		HttpServletRequest request = HttpContextUtils.getHttpServletRequest();
		return getIpAddr(request);
	}

	/**
	 * 获取请求 Header 'User-Agent'
	 * 操作系统和浏览器
	 * // 获取客户端操作系统
	 * String os = userAgent.getOperatingSystem().getName();
	 * // 获取客户端浏览器
	 * String browser = userAgent.getBrowser().getName();
	 *
	 * @return
	 */
	public static UserAgent getUserAgent() {
		return UserAgent.parseUserAgentString(HttpContextUtils.getHttpServletRequest().getHeader("User-Agent"));
	}

	/**
	 * 获取服务器内网IP
	 *
	 * @return
	 */
	public static String getHostIp() {
		try {
			return InetAddress.getLocalHost().getHostAddress();
		} catch (UnknownHostException e) {
			logger.error("IPUtils get server host IP exception", e);
		}
		return LOCAL_IP_ADDRESS;
	}

	/**
	 * 获取服务器内网名称
	 *
	 * @return
	 */
	public static String getHostName() {
		try {
			return InetAddress.getLocalHost().getHostName();
		} catch (UnknownHostException e) {
			logger.error("IPUtils get server host name exception", e);
		}
		return "未知";
	}
}
